Na saite Astrometriya Astronomicheskie instrumenty Astronomicheskoe obrazovanie Astrofizika Istoriya astronomii Kosmonavtika, issledovanie kosmosa Lyubitel'skaya astronomiya Planety i Solnechnaya sistema Solnce

Russkii astronom. R. v Odesse. Okonchil Novorossiiskii un-t v Odesse. Stazhirovalsya v Pulkovskoi observatorii. Slushal lekcii v Sorbonne. Rabotal v Parizhskoi, Potsdamskoi i Medonskoi observatoriyah, s 1905 - sotrudnik Pulkovskoi observatorii, iniciator sozdaniya v 1908 ee Simeizskogo otdeleniya.

Osnovnye nauchnye issledovaniya otnosyatsya k fizike Solnca. Poluchil isklyuchitel'nye po kachestvu fotografii solnechnyh pyaten, obnaruzhil zavisimost' formy solnechnoi korony ot kolichestva pyaten. V 1905 ustanovil, chto srednyaya prodolzhitel'nost' zhizni otdel'nyh granul sostavlyaet 2-5 min, zatem oni raspadayutsya i zamenyayutsya novymi. Uchastvoval v ekspediciyah na Novuyu Zemlyu, v Ispaniyu i Srednyuyu Aziyu dlya nablyudenii polnyh solnechnyh zatmenii, v 1897-1905 sovershil devyat' voshozhdenii na Monblan dlya opredeleniya solnechnoi postoyannoi, vnezatmeniyh nablyudenii solnechnoi korony, nablyudenii Venery. V 1899-1901 prinimal uchastie v ekspedicii na o-v Shpicbergen dlya gradusnyh izmerenii i opredeleniya sily tyazhesti.

Sekretar' Russkogo otdeleniya Mezhdunarodnoi solnechnoi komissii, vice-prezident Russkogo astronomicheskogo ob-va.

Medal' im. P. Zh. S. Zhansena Parizhskoi AN (1904). [134]

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